 
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=500" />
  <title>Popup</title>  
</head>

<body>
  <div style="padding:20px;width:150px;">
  <span id="clickMe" style="width:100px;margin:0 auto;border:1px #eee solid;cursor: pointer;display: block;padding:10px;text-align: center;">重新监测</span> 
</div>
  <script src="popup.js"></script>
</body>

</html>

